Hello, I am facing urination burning and thereafter urinary bladder burning all day long since last couple of months. Sometimes buring comes down but sometimes it is very bas. Urine culture is negative. Ultrasound reports are normal. High vaginal swab is normal. Have taken medicines for vaginal infections as well but nothing is completely healing  . Is there any test to check the urinary bladder inflammation. Ultrasound report shows it to be normal structurally or any idea what else could be the condition if uti is coming negative. Please help